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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>宝石</title>
    <!--动态改变视口缩放比-->
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        var iScale = 1;
        iScale = iScale / window.devicePixelRatio;
        document.write('<meta name="viewport" content="width=device-width,user-scalable=no,' +
            'initial-scale=' + iScale + ',minimum-scale=' + iScale + ',maximum-scale=' + iScale + '">');
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    <link rel="stylesheet" href="css/style.css">
    <link rel="stylesheet" href="css/swiper-3.4.2.min.css">
    <link rel="stylesheet" href="//at.alicdn.com/t/font_418862_2nj4i15waubrcnmi.css">

    <!--本页特殊样式-->
    <style>
        body{background: #E60012 url("images/zzz.png") no-repeat 0 21rem ;background-size:  100%;}
        .banner{display:block;width:85%;margin-left:auto;margin-right:auto;padding-top: 35rem}
        .banner .turnplate{display:block;width:100%;position:relative;}
        .banner .turnplate canvas.item{width:100%;}
        .banner .turnplate img.pointer {
            position: absolute;
            width: 91.5%;
            height: 90.5%;
            left: 6.4%;
            top: 7.2%;}

    </style>
    <!--特殊样式结束-->
</head>
<body>
<div class="header">
    <a class="gobak" href="javascript :history.back(-1)" >
        <img  src="images/back.png" alt="">
    </a>
    活动
</div>
<div class="fixed1"></div>
<div class="zhuan">
    <div class="top">
        <div class="left">
            <p class="day">已签到：0天</p>
            <p class="hide">您已获得一次抽奖机会</p>
        </div>
        <div class="right">
           <button class="qian">签到+0.5元</button>
        </div>
    </div>
    <div class="banner" >
        <div class="turnplate" >
            <canvas class="item" id="wheelcanvas" width="422px" height="422px"></canvas>
            <img class="pointer" src="images/turnplate-pointer.png"/>
        </div>
    </div>
    <div class="more_L" >
        温馨提示：<br>
        凡事收集超级返利四张卡片可获得 <br>
        价值998元黄金一根 <br>
    </div>
</div>
<div class="fixed2"></div>
<div class="footer">
    <ul>
        <li class="on">
            <a href="">
                <i class="pz pz-gerenzhongxin"></i>
                <p>个人中心</p>
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        </li>
        <li>
            <a href="">
                <i class="pz pz-zhuye1"></i>
                <p>公司简介</p>
            </a>
        </li>
        <li>
            <a href="">
                <i class="pz pz-tixian"></i>
                <p>提现</p>
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</div>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script src="js/swiper-3.4.2.min.js"></script>
<script src="js/awardRotate.js"></script>
<script type="text/javascript" src="js/index.js"></script>
<script type="text/javascript">
    var turnplate={
        restaraunts:[],				//大转盘奖品名称
        colors:[],					//大转盘奖品区块对应背景颜色
        outsideRadius:192,			//大转盘外圆的半径
        textRadius:155,				//大转盘奖品位置距离圆心的距离
        insideRadius:68,			//大转盘内圆的半径
        startAngle:0,				//开始角度

        bRotate:false				//false:停止;ture:旋转
    };

    $(document).ready(function(){
        //动态添加大转盘的奖品与奖品区域背景颜色
        turnplate.restaraunts = ["5元", "利卡", "谢谢惠顾", "10元", "返卡", "5元","级卡", "谢谢惠顾 ","10元", "超卡"];
        turnplate.colors = ["#FFD658", "#A030C4", "#FFD658", "#74B81D","#FFD658", "#FF5A00", "#FFD658", "#1D5FD6","#FFD658", "#D00032"];


        var rotateTimeOut = function (){
            $('#wheelcanvas').rotate({
                angle:0,
                animateTo:2160,
                duration:8000,
                callback:function (){
                    alert('网络超时，请检查您的网络设置！');
                }
            });
        };

        //旋转转盘 item:奖品位置; txt：提示语;
        var rotateFn = function (item, txt){
            var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length*2));
            if(angles<270){
                angles = 270 - angles;
            }else{
                angles = 360 - angles + 270;
            }
            $('#wheelcanvas').stopRotate();
            $('#wheelcanvas').rotate({
                angle:0,
                animateTo:angles+1800,
                duration:8000,
                callback:function (){
                    alert(txt);
                    turnplate.bRotate = !turnplate.bRotate;
                }
            });
        };3

        $('.pointer').click(function (){
            if(turnplate.bRotate)return;
            turnplate.bRotate = !turnplate.bRotate;
            //获取随机数(奖品个数范围内)
            var item = rnd(1,turnplate.restaraunts.length);
            //奖品数量等于10,指针落在对应奖品区域的中心角度[180, 144, 108, 72, 36, 360, 324, 288]
            rotateFn(item, turnplate.restaraunts[item-1]);
            /* switch (item) {
             case 1:
             rotateFn(252, turnplate.restaraunts[0]);
             break;
             case 2:
             rotateFn(216, turnplate.restaraunts[1]);
             break;
             case 3:
             rotateFn(180, turnplate.restaraunts[2]);
             break;
             case 4:
             rotateFn(144, turnplate.restaraunts[3]);
             break;
             case 5:
             rotateFn(108, turnplate.restaraunts[4]);
             break;
             case 6:
             rotateFn(72, turnplate.restaraunts[5]);
             break;
             case 7:
             rotateFn(36, turnplate.restaraunts[6]);
             break;
             case 8:
             rotateFn(360, turnplate.restaraunts[7]);
             break;
             case 9:
             rotateFn(324, turnplate.restaraunts[8]);
             break;
             case 10:
             rotateFn(288, turnplate.restaraunts[9]);
             break;
             } */
            console.log(item);
        });
    });

    function rnd(n, m){
        var random = Math.floor(Math.random()*(m-n+1)+n);
        return random;

    }


    //页面所有元素加载完毕后执行drawRouletteWheel()方法对转盘进行渲染
    window.onload=function(){
        drawRouletteWheel();
    };

    function drawRouletteWheel() {
        var canvas = document.getElementById("wheelcanvas");
        if (canvas.getContext) {
            //根据奖品个数计算圆周角度
            var arc = Math.PI / (turnplate.restaraunts.length/2);
            var ctx = canvas.getContext("2d");
            //在给定矩形内清空一个矩形
            ctx.clearRect(0,0,422,422);
            //strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式
            ctx.strokeStyle = "#FFBE04";
            //font 属性设置或返回画布上文本内容的当前字体属性
            ctx.font = '16px Microsoft YaHei';
            for(var i = 0; i < turnplate.restaraunts.length; i++) {
                var angle = turnplate.startAngle + i * arc;
                ctx.fillStyle = turnplate.colors[i];
                ctx.beginPath();
                //arc(x,y,r,起始角,结束角,绘制方向) 方法创建弧/曲线（用于创建圆或部分圆）
                ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);
                ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);
                ctx.stroke();
                ctx.fill();
                //锁画布(为了保存之前的画布状态)
                ctx.save();

                //----绘制奖品开始----
                ctx.fillStyle = "#000";
                var text = turnplate.restaraunts[i];
                var line_height = 17;
                //translate方法重新映射画布上的 (0,0) 位置
                ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);

                //rotate方法旋转当前的绘图
                ctx.rotate(angle + arc / 2 + Math.PI / 2);

                /** 下面代码根据奖品类型、奖品名称长度渲染不同效果，如字体、颜色、图片效果。(具体根据实际情况改变) **/
                if(text.indexOf("M")>0){//流量包
                    var texts = text.split("M");
                    for(var j = 0; j<texts.length; j++){
                        ctx.font = j == 0?'bold 20px Microsoft YaHei':'16px Microsoft YaHei';
                        if(j == 0){
                            ctx.fillText(texts[j]+"M", -ctx.measureText(texts[j]+"M").width / 2, j * line_height);
                        }else{
                            ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
                        }
                    }
                }else if(text.indexOf("M") == -1 && text.length>6){//奖品名称长度超过一定范围
                    text = text.substring(0,6)+"||"+text.substring(6);
                    var texts = text.split("||");
                    for(var j = 0; j<texts.length; j++){
                        ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
                    }
                }else{
                    //在画布上绘制填色的文本。文本的默认颜色是黑色
                    //measureText()方法返回包含一个对象，该对象包含以像素计的指定字体宽度
                    ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
                }

                //添加对应图标
                if(text.indexOf("闪币")>0){
                    var img= document.getElementById("shan-img");
                    img.onload=function(){
                        ctx.drawImage(img,-15,10);
                    };
                    ctx.drawImage(img,-15,10);
                }else if(text.indexOf("谢谢参与")>=0){
                    var img= document.getElementById("sorry-img");
                    img.onload=function(){
                        ctx.drawImage(img,-15,10);
                    };
                    ctx.drawImage(img,-15,10);
                }
                //把当前画布返回（调整）到上一个save()状态之前
                ctx.restore();
                //----绘制奖品结束----
            }
        }
    }

</script>

</body>
</html>